Caesar cipher

Your task is to break hardcoded userid password and log in into application.

hpAndro · hpandro.java.infosec.caesar

Not rated yet 100+ downloads v1.0 2.5 MB Android 4.1+ PEGI 3 · Everyone

Download APK 2.5 MB All versions

At a glance

Latest version: v1.0 (1)
Updated: Mar 15, 2019 (7 years ago)
APK size: 2.5 MB
Requires: Android 4.1+ (API 16)
CPU support: Any (no native code)
Category: Education (app)
Permissions: 3
Developer contact: [email protected]

About this APK

Caesar cipher is an app by hpAndro in the Education category. It has no native code, so it runs on any Android processor.

It asks for 3 permissions, none of them sensitive.

Description

From the listing uploaded by “wahyuli”.

In cryptography, a Caesar cipher, also known as Caesar's cipher, the shift cipher, Caesar's code or Caesar shift, is one of the simplest and most widely known encryption techniques. It is a type of substitution cipher in which each letter in the plaintext is replaced by a letter some fixed number of positions down the alphabet. For example, with a left shift of 3, D would be replaced by A, E would become B, and so on. The method is named after Julius Caesar, who used it in his private correspondence. The Caesar cipher can be easily broken even in a ciphertext-only scenario. Two situations can be considered: 1. an attacker knows (or guesses) that some sort of simple substitution cipher has been used, but not specifically that it is a Caesar scheme; 2. an attacker knows that a Caesar cipher is in use, but does not know the shift value. Your task is to break hardcoded userid password and log in into application.

Security & authenticity

Security rating: Trusted

Signing certificate

Certificate with Google's generic name Google Play App Signing gives the keys it manages this name, but anyone can put it in a certificate, so this alone proves nothing.

Store checks and file details

Developer signature verified Mar 14, 2020
Antivirus scan passed Oct 13, 2020
Signed byCN=Android, OU=Android, O=Google Inc., L=Mountain View, ST=California, C=US
Signing certificate (SHA-1)4F:4C:CC:9F:8E:86:EE:3C:51:19:81:0B:DF:6C:2E:04:3A:C2:34:8B
File MD52f8c6d0dbe52c0e620754b6c8bffbb44
Uploaded by “wahyuli” 1 followers · uploading since 2018

Scans and ratings come from the source store; the certificate comparisons are AAPKs's own, made from the files' published signatures. AAPKs doesn't scan files itself — compare the MD5 and signer after downloading.

Permissions (3)

Caesar cipher requests 3 permissions, none of them sensitive.

Full network access android.permission.INTERNET
View Wi-Fi connections android.permission.ACCESS_WIFI_STATE
View network connections android.permission.ACCESS_NETWORK_STATE

Required hardware & features

Touchscreen android.hardware.touchscreen
Wi-Fi android.hardware.wifi

Caesar cipher APK: questions and answers

Can I install this APK over the version I already have?

Only if it is signed with the same certificate as the copy on your phone and isn't an older version. If Android says “App not installed”, the certificates differ; uninstalling your copy first works but deletes its data unless it is backed up.

Is the Caesar cipher APK safe?

No one can promise that a file is safe, but some things can be checked. The source store rates this file Trusted. After downloading, check that the file's MD5 is 2f8c6d0dbe52c0e620754b6c8bffbb44.