ciphertest: command not found

Maybe Your $PATH variable doesn't contain the default paths? echo $PATH should give something like:

[root@server ~]# echo $PATH
/usr/local/sbin:/usr/local/bin:/sbin:/bin:/usr/sbin:/usr/bin:/root/bin

If it's empty, You may set the PATH variable with this command

export PATH="/usr/local/sbin:/usr/local/bin:/sbin:/bin:/usr/sbin:/usr/bin:/root/bin"

On CentOS possible default full paths are:

/usr/bin/ciphertest - from package: ciphertest

You may install the required package with command yum install {package}

Error in other languages:
ciphertest: bevel nie gevind nie
ciphertest: comandă negăsită
ciphertest: comando não encontrado
ciphertest: commande introuvable
ciphertest: command not found
ciphertest: käsku ei ole
ciphertest: không tìm thấy lệnh
ciphertest: komanda nerasta
ciphertest: Kommando nicht gefunden.
ciphertest: kommandot finns inte
ciphertest: komut yok
ciphertest: nie znaleziono polecenia
ciphertest: níor aimsíodh an t-ordú
ciphertest: no se encontró la orden
ciphertest: no s'ha trobat l'ordre
ciphertest: opdracht niet gevonden
ciphertest: parancs nem található
ciphertest: perintah tidak ditemukan
ciphertest: príkaz nenájdený
ciphertest: příkaz nenalezen
ciphertest: команда не найдена
ciphertest: командата не е открита
ciphertest: 命令找不到
ciphertest: コマンドが見つかりません