Durga sapthshathi

Durgasapthasathi was given by lord brahma for the protection of devotees.just like Vedas durgasapthasathi is very old which describes the glory of Devi.It is greatest way to worship Devi.Saptha means 7 and sathi means 100.Totally there are 700 sholakas.
It is divided into three parts called as pratham madhyam and Utama chrita consisting of 13 chapters.Is the most powerful book or rather a technology to get shakti.
700 sholakas are locked with another important mantra. Unless this key mantra are recited one cannot get the benefit of reading the sapthashathi.
It is called as Uttakilan mantra.,and this has to be recited first for 108 times through lalchandan or rudraksha  Mala.
The mantra is as follows
OM SHREEM Shreem shreem kleem huum om aiyam kshobhaya.mohaya utkilaya utkilaya tam tam.

If unable to read sapthashathi SIddakunjika stotram can be recited.this stotram is available on internet.
If unable to read this Sanskrit sholakas 32 namavallis of of durga can be recited.
They are as follows

Durgādvātriḿśatnāmamālā

32 names: 1) Durgā; 2) Durgatirśaminī, Who destroys bad times; 3) Durgāpadvinivāriṇī, Who removes obstacles; 4) Durgamacchedinī, Who pierces hardest destinations; 5) Durgasādhinī, Who tames the hardest situations; 6) Durganāśinī, Who destroyed Durga¹; 7) Durgatoddhāriṇī, Who uplifts from bad fate; 8) Durgenihantrī, impossible to be slayed; 9) Durgamāpahā, Who destroys difficulties; 10) Durgamajñānadā, Who bestows of difficult knowledge; 11) Durgadaityalokadavānalā, Who is fire for mighty-tree-like demon civilization; 12) Durgamā, Who is hard to approach or parallel; 13) Durgamālokā, Who is the abode of irrepressible glow; 14) Durgamātmasvarūpiṇī, Who is the hard to reach Ātman-form; 15) Durgamārgapradā, Who bestows of difficult to achieve path, 16) Durgamavidyā, Who is the hard to achieve knowledge; 17) Durgamāśritā, Who is supported by divinity; 18) Durgamajñānasaḿsthānā, Who is the abode of hard to achieve knowledge; 19) Durgamadhyānabhāsinī, Who appears as light during intent meditation; 20) Durgamohā, Who is immense bondage; 21) Durgamagā, Who is difficult to attain or reach; 22) Durgamārthasvarūpiṇī, Who is the difficult knowledge; 23) Durgamāsurasanhantrī, Who destroys the imsurpassable demons; 24) Durgamāyudhadhāriṇī, Who possesses irrepressible weapons; 25) Durgamāńgī, Who has strong limbs; 27) Durgamatā, Who is difficult; 27) Durgamyā, Who is hard to visit; 28) Durgameśvarī, Who is the Goddess of everything difficult to achieve, 29) Durgabhīmā, Who is gallant; 30) Durgabhāmā, Who is very wrathful; 31) Durgabhā, Who has impeccable shine; and 32) Durgadāriṇī, Who bestows induplicable happiness.||1—5||